diff --git a/setup.py b/setup.py
index 803c131..1f2a3de 100644
--- a/setup.py
+++ b/setup.py
@@ -25,10 +25,10 @@ setup(name="magic-wormhole",
                      "wormhole-server = wormhole.server.runner:entry",
                      ]},
       install_requires=["spake2==0.3", "pynacl", "argparse",
-                        "six", "twisted >= 16.1.0", "hkdf", "tqdm",
-                        "autobahn[twisted]", "pytrie",
-                        # autobahn seems to have a bug, and one plugin throws
-                        # errors unless pytrie is installed
+                        "six",
+                        "twisted==16.1.1", # since autobahn pins it
+                        "autobahn[twisted]",
+                        "hkdf", "tqdm",
                         ],
       extras_require={"tor": ["txtorcon", "ipaddr"]},
       test_suite="wormhole.test",